• 3/8 BSPP bi-directional flow control valve
    Regular price £18.04
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    3/8 BSPP bi-directional flow control valve

    Key Features

    • Type: bi-directional flow control valve
    • Ports: 3/8 BSPP
    • Control: meters flow in both directions for consistent actuator speed
    • Adjustment: fine thread needle/knob for repeatable settings
    • Use: speed control of motors or cylinders under varying load
    Regular price £18.04
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 1/4 BSPP Bi-Directional Flow Control Valve
    Regular price £18.04
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    1/4 BSPP Bi-Directional Flow Control Valve

    Key Features

    • Type: straight adaptor (BSP threading per title)
    • Threads: 1/4 thread
    • Standard: BSPP parallel per ISO 228 unless otherwise specified
    • Material: plated carbon steel for hydraulic service
    • Use: join hoses; valves; pipe runs or adapt port sizes
    Regular price £18.04
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  • Hydra Part Flow Regulator Valves with Needle Shut Off - Approved Hydraulics
    Regular price From £31.10
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    Flow Regulator Valves with Needle Shut Off

    Key Features

    • Type: bi directional flow regulator with needle shut off
    • Function: adjust flow ; fully close with needle
    • Ports: bsp sizes
    • Typical sizes: 1/4" ; 3/8" ; 1/2"
    • Use: meter actuator speed both directions
    Regular price From £31.10
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • Hydra Part Flow Regulator Valves with Check (Uni-directional) - Approved Hydraulics
    Regular price From £36.86
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    Flow Regulator Valves with Check (Uni-directional)

    Key Features

    • Type: uni directional flow regulator with check
    • Function: meter in one direction ; free flow via check in reverse
    • Ports: bsp sizes
    • Typical sizes: 1/4" ; 3/8" ; 1/2"
    • Use: control actuation speed in one direction
    Regular price From £36.86
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    • Delivery to UK & Ireland
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  • Adam Hindle

    Sales Director

    I began my engineering career at Stockport College in around 2005, first completing a National Diploma in Electrical Engineering, followed by a Higher National Diploma in Mechanical Engineering. I then progressed to the University of Salford, where I earned a BEng (Hons) degree in Mechanical Engineering.

    After graduating, I started my professional career with Approved Hydraulics. I initially gained a combination of hands-on workshop experience and telephone-based sales experience. In later years, I moved into a full-time sales role and led the new crane and excavator attachments department that the company had recently established.

  • KETA 3 Way Priority Pressure Compensaed Flow Control Valve Cartridge
    Regular price £62.35
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    KETA 3 Way Priority Pressure Compensaed Flow Control Valve Cartridge

    Key Features

    • Type: 3 way priority pressure compensated flow control cartridge
    • Operation: maintains constant controlled flow regardless of load
    • Bypass: reverse flow bypass via internal check path
    • Porting: LFR 10 3A cavity family
    • Use: priority feed for steering or auxiliary functions
    Regular price £62.35
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  • 1" BSPP Bi-directional Flow Control Valve
    Regular price £52.50
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    • Delivery to UK & Ireland

    1" BSPP Bi-directional Flow Control Valve

    Key Features

    • Type: bi-directional flow control valve
    • Ports: 1 BSPP
    • Control: meters flow in both directions for consistent actuator speed
    • Adjustment: fine thread needle/knob for repeatable settings
    • Use: speed control of motors or cylinders under varying load
    Regular price £52.50
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • 3/4" BSPP Bi-directional Flow Control Valve
    Regular price £40.24
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    • Delivery to UK & Ireland

    3/4" BSPP Bi-directional Flow Control Valve

    Key Features

    • Type: bi-directional flow control valve
    • Ports: 3/4 BSPP
    • Control: meters flow in both directions for consistent actuator speed
    • Adjustment: fine thread needle/knob for repeatable settings
    • Use: speed control of motors or cylinders under varying load
    Regular price £40.24
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BSPP One Way Flow Control Valve - Barrel Type - Approved Hydraulics Limited
    Regular price From £21.68
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    BSPP One Way Flow Control Valve - Barrel Type

    Key Features

    • Type: one-way flow control (throttle/check)
    • Ports: as specified
    • Function: free flow one direction; metered flow opposite via needle
    • Body: barrel pattern for in-line mounting
    • Use: control extend or retract speed on cylinders
    Regular price From £21.68
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BSPP Adjustable Compensated Flow Control Valve
    Regular price From £43.16
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    BSPP Adjustable Compensated Flow Control Valve

    Key Features

    • Type: pressure-compensated adjustable flow control
    • Ports: as specified
    • Function: maintains set flow largely independent of load/pressure
    • Bypass: integrated check for free flow opposite direction
    • Use: stable actuator speed under varying loads
    Regular price From £43.16
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    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery
  • BSPP One Way Flow Control Valves - Approved Hydraulics Limited
    Regular price From £19.97
    • All Items Guaranteed
    • Delivery to UK & Ireland

    BSPP One Way Flow Control Valves

    Key Features

    • Type: one-way flow control (throttle/check)
    • Ports: as specified
    • Function: free flow one direction; metered flow opposite via needle
    • Body: barrel pattern for in-line mounting
    • Use: control extend or retract speed on cylinders
    Regular price From £19.97
    • All Items Guaranteed
    • Delivery to UK & Ireland
    • Order by 3pm for Next Day Delivery

Flow Regulator Valves

Common Calculations FAQs

Calculating force, speed, pressure, power, and efficiency in hydraulic applications.

How do you calculate actuator speed?

Actuator speed is determined by flow rate and cross-sectional area:

Speed = Flow rate ÷ Area

Flow rate is the volume of fluid delivered (in L/min or GPM).

Area is the cross-sectional area of the actuator piston: π × (diameter ÷ 2)².

How do you calculate cylinder force?

Cylinder force can be calculated using:

Force = Pressure × Area

Pressure is the system pressure (in psi or bar).

Area is the cross-sectional area of the cylinder bore (in square inches or square centimeters).

Area = π × (bore diameter ÷ 2)².

How do you calculate pressure drop across a valve?

Pressure drop can be calculated using the valve flow coefficient (Cv):

Pressure Drop (ΔP) = (Flow Rate)² ÷ (Cv² × Fluid Density)

Flow Rate is the fluid flow (in GPM or L/min).

Cv is the valve flow coefficient.

Fluid Density is the density of the hydraulic fluid.

How do you size an accumulator?

Accumulator sizing considers required flow, pressure, and pre-charge:

Accumulator Volume = Flow Rate × Time ÷ Pressure

This determines how much fluid must be stored to maintain system pressure.

How to convert psi to bar?

Use the conversion factor: 1 bar = 14.5 psi.

To convert psi to bar, divide psi by 14.5.

Example: 200 psi ÷ 14.5 = 13.79 bar.

What is pre-charge pressure in an accumulator?

Pre-charge pressure is the initial gas pressure in the accumulator before fluid enters.

It helps maintain system pressure as the accumulator discharges.

Typically set to 70–80% of system operating pressure.

What is specific gravity of hydraulic fluid?

Specific gravity is the ratio of hydraulic fluid density to water.

A value of 1 means equal density.

Less than 1 means the fluid floats; greater than 1 means it sinks.

What is torque in a hydraulic motor?

Torque is the rotational force produced based on system pressure and motor displacement:

Torque = Pressure × Displacement ÷ 2π

Pressure is the operating system pressure.

Displacement is the volume displaced per revolution (in cubic inches or cubic centimeters).

What unit is hydraulic power measured in?

Hydraulic power is measured in horsepower (HP) or kilowatts (kW).

Hydraulic horsepower can be calculated using:

HP = (Pressure (psi) × Flow rate (GPM)) ÷ 1714.

What’s the relationship between pump speed and flow?

Flow rate is directly proportional to pump speed.

If pump speed doubles, flow rate doubles (assuming constant displacement).

This is important when adjusting flow or selecting a pump for varying speeds.